Electrical rock-drill or rock-drilling machine.



PATENTED ov. 24, 1903.

A. H. GIBSON. ELECTRICAL ROCK DRILL 0R ROCK DRILLING MACHINE.

3 SHEETS-SHBET 1.

APPLICATION FILED MAY 10.1902. NO MODEL. 6

Q Q 0 Q MN w s Q PM h ma o 0 k o QQ \NnN Q\ M w Q m 0 m w Q Q B o QQ @QPATENTED NOV. 24, 1903.

A. H. GIBSON.

ELECTRICAL R00K DRILL 0R ROCK DRILLING MACHINE.

APPLICATION FILED MAY 10, 1902.

3 SHEETSSHEET 2.

NO MODEL.

Wjtizesa'eaz- I ZI PATENTED NOV. 24, 1903.

A. H. GIBSON. ELECTRICAL ROCK DRILL OR ROCK DRILLING MACHINE.

APPLICATION FILED MAY 10. 1902 3 SHEETS-SHEET 3.

N0 MODEL.

KE wk W x IN O Inventor.-

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THE uonms PETERS c0 mom-Limo msumm'ow, o. c.

tit. 744,9i2'.

UNITED STATES Patented November 24, 1903 PATENT @FFlCFt ELECTRICALROCK-DRILL OR ROCK-DRILLING MACHINE.

SPECIFICATION forming part of Letters Patent No. 744,912, dated November24, 190a Application filed May 10,1902. Serial No. 106,811. (No model.)

To all whom it may concern:

Be it known that I, ARTHUR HENRY GIB- SON, a subject of the King ofGreat Britain, residing on the property of the Lancaster Gold MiningCompany, Limited near Krugersdorp, Transvaal, have invented certain newand useful Improvements in Electrical Rock-Drills or Rock-Drillin gMachines, (for Which I have applied for Letters Patent in the Transvaal,No. 283, filed January 31, 1902,) of which the following is aspecification.

This invention has reference to certain improvements in or applicable toelectrically driven or operated rock-drilling machines. Although it isdesigned more particularly to be applied in the construction of a drillchiefly intended for stoping Work, it may with advantage be utilized inthe construction of other kinds or classes of rock-drills or rockdrilling machines or other like machines adapted for general mining,quarrying, or similar work to which the improvements may be foundapplicable.

As hitherto constructed electricallyoperated percussive rock-drills havenot been adapted for continuous use in ordinary mining-work on accountof many and various imperfections in their construction, and as aconsequence they have not come into general use.

The present improvements are designed with the object of providing apractical drill or machine of comparatively simple cons truction,capable of being easily understood, handled, and worked by miners.

A drill embodying my improvements possesses, among others, the followingadditional important features and advantages: In it the motor is removedfrom the direct line of shock,-

the parts are so arranged that holes can be drilled in foot or hangingwalls, an absence of protruding parts or pieces, a firm support of allworking parts, the c'ontin uity of the case and water-tightness thereof,the small number of parts and the simplioityof their assemblement, thereasonably small Weight, and the small consumption of current or energy.

As Will be understood from the preceding statements, my inventionrelates more especially to the general construct-ion and arrangement ofthe drill and its appurtenances, and certain of the more importantimprovements, stated shortly, may be said to consist in the constructionof the slide-carriage and in the arrangement of the same so as to bedetachable or separable from the drill to fa zilitate transportation,particularly underground, although it need not of necessity be made intwo parts; in a worm-gear or mechanism for imparting the rotary motionto the drilling-bit and in the arrangement thereof in such a way thatshould there be great re sistance to the rotation of the bit that theconsequent great end pressure of the camshaft introduces pressure uponsome moving portions of the driving mechanism, so as to act as apowerful brake-as, for example, by binding or pinching the sides of themotor pinion-wheel between the stationary partition and the more slowlyrotating disk; in a driving-disk attached to a cam, the case or frameforming a bearing for the periphery or rim of the disk in which itrotates; in a cam operating in conjunction with a disk tappet, thelatter while free to revolve upon the drillbar being so constructed thatit will carry the drill-bar with it when it is moved longitudinally ofthe drill-casing; in a revolving tap pet and bearing-sleeve, an abuttingspiral spring, and a ball-bearing collar disposed between the spring andthe drill-case; in a concentric gear for reducing the high speed of theelectric motor; in the arrangement of the driving mechanism in anextension of the frame entirely to one side of the drill-bar and capableof being fixed in any radial direction from the drill-casing, and inalternately-reversing or forward-and-backward rotation of the drill-bitwith predominating movement in the forward or in one direction.

In working my improved drill the ordinary arrangements for supportingthe machine may be used, such as the stope or column-bar. The cross-armand cradle or other suitable and convenient devices may be employed insubstitution therefor.

The invention will be fully described by aid of the accompanyingdrawings, in which a rock-drill is illustrated constructed in accordancetherewith, and in which- Figure 1 represents a longitudinal sectiontaken through the drill-case. Fig. 2 is a section 011 line X X, Fig. 1,through the motoroase and gear-compartment Fig. is a sectappet and thecollar.

tion on line g y, Fig. 2, showing the concentric reduction-gear. Fig. 4is a plan of the drill. Fig. 5 is an end elevation of Fig. 4, and Fig. 6a side elevation of the drill or elevation at right angles to Fig. 4.Fig. 7 shows a longitudinal section of the slide-carriage with the drillmounted therein. Fig. 8 is a plan of the slide-carriage with the drillremoved; Fig. 9, an end elevation of Fig. 8. Fig. 10 is an elevation ofthe slotted extremity of the internal sliding tube of the slidecarriage;Fig. 11, a front elevation of the strap or clamp for clamping thesliding tube around the drill-case, and Fig. 12 a side elevation of thestrap or clamp.

Referring to Figs. 1 to (-3, illustrative of the drill, A indicates thedrill-bar, to the forward extremity of which the detachable drilling-bita may be attached by means of the ordinary cod-piece a and U -bolt (4 orin other suitable manner. The drill-barAis mounted centrally in thedrillcase B, in which it is free to be reciprocated, the frontportion 1) of the case B forming a bearing for it at one end and the endor cover Z) of the case at the other. The cylindrical rear portion 11 ofthe drill-case is screwed at 11 into the central casting or frontportion 1) of the case. The drill-bar is, as shown, preferably of hollowor tubular construction for the greater portion of its length. On thatportion of the drill-- bar contained within the case B is formed acollar or annular projection O, and around the drill-bar is arranged aloose concentric disk or circular tappet D, fitting over the collar Oand bearing against one side thereof. The tappet D is provided with aboss or cylindrical projection d, into which is screwed a bearing-s1eeved, concentric with the drillbar. The sleeve d is screwed into the boss01 up to the other or opposite side of the collar O and provides aconvenient means for taking up any wear or looseness between the Thisconstruction of these parts, which constitutes an extremely importantfeature of the invention, prevents any movement of the tappetlongitudinally of the drill-bar, insures a positive reciprocation of thebar with the tappet, and at the same time permits the tappet to revolveor roll freely aroundthe drill-bar whileflthe tappet is in-engagement orin contact with the cam. Any appreciable canting or tilting of thetappet is prevented by means'of the long bearing-sleeve cl and thefriction engendered distributed over a large area, thereby avoidingexcessive wear. Between the tappet D and the end or cover I) of the caseB and arranged concentrically around the drill-bar is a spiral spring E.The spring E at the forward end abuts against the rear face of thetappet D, and between the other end of the spring and the cover b arearranged two loose rings or collars d d grooved to form a racebetweenthem for friction-balls d". This enables the spring E to rotatewith the tappet during compression. As the tappet D, and

with it the drill-bar A, is depressed the spring is placed incompression, so that when the tappet is released or disengaged thespring acts to propel the drill-bar on its outward and percussivestroke. In place of the ball-bearing shown interposed between the springand the end of the case any other suitable and convenient constructionmay be adopted to eliminate the friction, or the spring could beardirectly against the cover I).

' The motor-case F comprises a cylindrical partfand a cover f, bolted toa flange f of the central casting b. The motor-case is, as shown,located at one side of the drill-case B. In the motor-case F is fittedand supported the stator G of the electric motor, and ar ranged inposition within it is the rotor G. The motor-spindle G at the one sideis supported in a closed bearing bush or socket g, fitted in the cover fand at the other side in a bearing formed for it in an internal disk ordiaphragm II, which disk separates the motor-compartment from thegear-compartment and forms an oil-tight partition between them. Themotor-spindle G projects through the diaphragm I'I into thegear-compartment and has keyed or otherwise fixed to its extremity apinion I. In a recess formed in the gearcompartment concentric with thepinion I is fixed an internally-toothed ring J, and in the annular spaceformed between the pinion and the teeth of the ring are arranged twocounterwheels K K, in which space they are free to travel around onmotion being imparted to them through the motor-pinion I. One, two, ormore such counter-wheels may be employed; but I at present prefer toemploy two arranged diametrically opposite one another, as shown moreparticularly in Fig. In the gear-case, arranged alongside the wheels K Kand located in an annular recess formed in the case, is a disk L. Therecess provided in the case for the disk L forms a bearing for the rimor periphery thereof, in which it is free to rotate. In the side of thedisk L next the wheels K K two pins or studs ZZ are fixed, whichenterthe centers of the counter-wheels, so that as the counter-wheelsare propelled in their annular path on the rotation of the motor-pinionI a rotary motion is transmitted to the disk L through the medium of thesaid pins. Attached to the disk L and rotated by it is a short cam-shaftM, whose axis is at right angles to the axis of the drill-bar, theextremity of which shaft works in a bearing formed by a recess in thecasing. On the shaft M, between the disk L and the bearing, is fixed thecam N, arranged so as to project through into the drill-case B as itrotates and to engage and press back the tappet D at each revolution, aswill be readily understood on reference to Figs. 1 and 2 of thedrawings.

To effect the rotation of the drill-bit a a portion of arevolutionduring each stroke, a worm or worm-thread n is formed on thatpart of the cam-shaft M adjacent to the drillbar, A, (see Fig. 2,) andteeth 47. are formed IIO longitudinally of the drill-bar A, (see Figs. 1and 2,) with which the worm n gears of engages, thereby imparting arotary motion to the drill-bar A. The teeth n are of spiral form ationin order to obtain a predominating rotatory movement of the drilling-bitin the forward or in one direction. Instead of this arrangement, theordinary ratchet-gear employed in air-drills f or the same purpose maybe used.

In order to prevent the tappet D or other of the reciprocating partsfrom striking violently against the drill-case, a buffer 0, of leather,rubber, or other suitable material, is fixed on the outside of the coverZ) of the case B. The buffer is retained in this position by the metalcap or ring 0, fixed to the cover I) by the bolts or screws 0 and thenuts 0 The cap or ring 0 is formed with an outward cylindricalprojection 0 and the end of the drill-bar witha shoulder or projection oso arranged that they will come in contact and absorb the shock in theevent of the drillbar being reciprocated and the drilling-bit from anycause not striking the face of the rock. The buffer may, if preferred,be fitted between the inner end-of the drill-case B and the tappet Dinstead of on the cover I) or in any other convenient position.

Referring to Figs. 7 to 12, in which the slidecarriage of the drill isillustrated, P and P represent two concentric tubes, the inner andsliding tube P telescoping into the outer and fixed tube P. The externalstationary tube P is fixed at the forward extremity within the supportor bracket 1), which is formed with a saucer or conical projection 19,by which means it may be clamped to the ordinary or other suitablesupport for the drill. The 111- ner tube P is free to slide in the tubeP and has affixed to it a block 13 which slides in a longitudinal slot19 provided therefor in the outer tube P, to prevent the rotation of thetube P during the feeding of the drill. The feeding-screw Q is disposedcentrally of the tubes P P and projects through into the hollow centerof the drill-bar A. The screw passes through the end of the externaltube P and gears the feeding-nut q, fitted in the end of the internalsliding tube P, so that as the screw is rotated by the handle (1,affixed to its outer extremity, the inner tube P slides forward orbackward in the outer tube P, according to the direction of rotation ofthe screw. On the feeding-screw, inside the tube P, is formed a collaror shoulder bearing against the end of the tube, and on the outsidethereof, between the handle q and the tube end, is arranged a strongspiral spring R. This arrangement prevents any appreciable movement ofthe feeding-screw Q longitudinally of the tube P and allows it to rotatefreely. The spring R, while acting to prevent any longitudinal movementof the screw, as before described, is employed to allow the drill-caseB, sliding-tube P, and feeding-screw Q to yield and move toward the ofthe drill-bar A yielding to the action of v the cam N the whole of thepercussive apparatus is carried bodily forward against the spring R.

In Fig. '7 the drill is shown mounted in position in the slide-carriage.The drill-case B is inserted into the closely-fitting sliding tube P.The extremity of the inner tube P", in which the drill-case fits, isslotted in several places, as shown at 7', (see Figs. 10 and 11,) toenable the tube to be firmly clamped around the drill-ease. The strap orclamp S embraces the slotted end of the tube and is operated by thescrew 3 to draw the two ends of the strap together to tighten or clampthe tube around the drill-case. This construction of slide-carriageallows the motor-case to be turned in any radial direction out of theway as may be required, according to the nearness and shape of the rockface.

What I claim as my invention, and desire to protect by Letters Patent,is-

1. In a rock-drill or rock-drilling machine, in combination, thedrill-bar A, the collar or annular projection 0 formed thereon, thecircular tappet or disk D mounted concentrically on the bar A and freeto rotate thereon and bearing against one side of the collar 0, the bosscl of the tappet and the bearing-sleeve d screwed into the boss (Z so asto reciprocate the drill-bar as the tappet is moved in a path parallelto the longitudinal axis of the bar while permitting it to revolvefreely, the spiral spring E arranged concentrically around the drill-barand bearing against the tappet at one end, and the ball-bearing collarinterposed between the other end of the spring and the drill-case,substantially as described.

2. In combination the drill-bar A, the collar O, the rotating tappet Dfitting over the collar and engaging one side thereof, the boss (I ofthe tappet, the long concentric bearingsleeve (Z, screwed into the boss(Z up to the opposite side of the collar 0, the spiral spring E bearingagainst the tappet, and the loose collars d d and friction-balls dlocated between them, to permit the spring E to rotate with the tappetduring compression of the spring, and means for forcing the drill -barbackward to compress the spring and to release it to enable thedrill-bar to be propelled on its outward and percussive stroke,substantially as described.

In a rock-drill the combination with the drill-bar and theconcentrically-disposed rotating tappet and its operating-spring, of acam fixed to a cam shaft arranged transversely of the drill-bar so thatas the cam is rotated it engages the tappet to force it backward tocompress the spring and then releases it to permit it to be propelled011 its outward and percussive stroke, the recess in the gearv tionaryconcentric rack, and an interposed idler-gear carried by the said disk,substantially as described.

4. In a rock-drill the combination with the electric motor and itsspindle G of the pinion I, the concentric internally-toothed ring J thecounter-wheels K K gearing-pinion I with ring J, the disk L andcam-shaft M con nected therewith, the pins Z Z affixed to the disk L,projecting into the centers of the Wheels K K to transmit the motion ofthe motor to the cam N, the cam N, revoluble tappet D and drill-bar A,substantially as described; v

5; In combination, the electric motor G G and'its spindle G the disk ordiaphragm II, forming a bearing for the motor-spindle and adivision-plate between the motor and gear compartments, the pinion I,fixed internallytoothed ring J, and counter-wheels K K, the

disk L and the recess in the gear-case form- }iug-a bearing therefor,the pins ZZ fixed to liihdisk L and projecting into the centers ofthecounter-wheels' K K, the cam-shaftM attached to the disk L, therecess in the gearcase forming a bearing for the cam-shaft M,

the cam N, the revoluble tappet D, the drillbar A. and the collar Oformed thereon, the bearing sleeve cZ screwed into the tappet againstthe collar, the concentric spiral spring E and ball-bearing collars d(F, substantially as and for the purposes described.

6. In a rock-drill, the combination with the drill-case B and its coverI), of the buffer 0, the cap or cover 0 fixing the buffer to the coverI), the outward cylindrical projection 0 and the shoulder or projection0 formed on the extremity of the drill-bar A, substantially as and forthe purposes described. -71 The combination in a rock-drill of thedrill-case the hollow drill-bar A, the two concentric tubes P P theslots 0" formed in the extremity of the sliding inner tube, the strap orclamp S for clamping the extremity of the tube around the drill-case,the centrally -arranged feeding-screw Q, the feeding-nut q fitted in theinner end of the inner tube P, the block 19 and the longitudinal slot 19to prevent the rotation of the inner tube, the collar (1 the strongspiral spring R, the handle q and the support 13 for the outer tube,substantially as and for the purposes described.

8. In arock-drill, in combination, the drillbar A, the drill-case B andits cover 1), forming a bearing for the rear end of the drill-bar, thecenter portion 1) of the case forming a bearing for the forward end ofthe bar, the collar (3 formed 011 the drill-bar and the concentricrevoluble tappet D mounted thereon, the bearing-sleeve d fitted into thetappet, the spring E and ball-bearing collar located between the end ofthe spring E and the cover Z), the motor-case F radially disposedrelative to the drill-case B, the electric motor G G and spindle G thebearing-socket for the spindle Gr fitted in the cover of the motor-case,the division-plate H forming a bearing for the spindle G the pinion Ifixed on the end of spindle G the concentric internally-toothed ring Jand the counter-wheels K K, the r0- tatable disk L and cam-shaft M andcam N attached thereto, the pins Z Z of the disk L entering the centersof the counter-wheels, the worm n and spiral teeth n on the drillbar,the buffer 0, cap 0 and projection 0 thereof and the shoulder 0 of thedrill-barA, substantially as described.

9. In a rock-drill the combination of the hollow drill-bar A, the collar0, the revoluble tappet D and bearing-sleeve d, the spring E andball-bearing collar between the end thereof and the drill-case, themotor-case F located to one side of the drill-case B and capable ofbeing turned in any radial direction therefrom, the electric motor G Gand its spindle G the pinion I fixed in the end thereof, the concentricinternally-toothed ring J,the counter-wheels K K, the disk L and thepins Z Z projecting into the centers of the wheels K K, the cam-shaft Mand cam N fixed to the disk L, the stationary tube P of theslide-carriage, the sliding tube P telescoping into the tube P, slottedat the end to be clamped around the drill-case, the clamp S the block 19of the inner tube P and the longitudinal slot 19 in the'outer tube, inwhich it slides, the feedingnut q fixed in the end of the inner tube,the feeding-screw Q, the collar g and spring R and the handle q forrotating the feedingscrew to feed the drill forward, substantially asdescribed and illustrated in the drawings.

In witness whereof I have hereunto 'set my hand in the presence of twosubscribing witnesses.

ARTHUR HENRY GIBSON.

Witnesses:

A. W. MACGREGOR, OHAs. OVENDALE.

